The Supreme Court ruled today on the EPA’s authority under the Clean Air Act to regulate carbon emissions from new power plants, and if you’ve gotten to this half of the sentence I presume you are a daily reader. Welcome back. The Supreme Court has ruled, importantly, that the EPA either can or cannot curb greenhouse emissions the way it wants. It depends on whom you ask. I first learned of this decision from the LA Times, which reported that Supreme Court limits EPA authority on power plants. Then, balance-seeking perspicator that I am, I read in the other Times that Justices, With Limits, Let E.P.A. Curb Power-Plant Gases. A computer would tell you those sentences say the same thing.